/*
 * Created on Aug 24, 2009
 * Created by Paul Gardner
 * 
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License only.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package com.aelitis.azureus.core.peermanager.unchoker;

import org.gudy.azureus2.core3.util.Debug;

public class UnchokerFactory {
    public static final String DEFAULT_MANAGER = "com.aelitis.azureus.core.peermanager.unchoker.UnchokerFactory";

    private static UnchokerFactory factory = getSingleton(null);

    public static UnchokerFactory getSingleton() {
        return (factory);
    }

    private static UnchokerFactory getSingleton(String explicit_implementation) {
        String impl = explicit_implementation;

        if (impl == null) {

            impl = System.getProperty(DEFAULT_MANAGER);
        }

        if (impl == null) {

            impl = DEFAULT_MANAGER;
        }

        try {
            Class impl_class = UnchokerFactory.class.getClassLoader().loadClass(impl);

            factory = (UnchokerFactory) impl_class.newInstance();

        } catch (Throwable e) {

            Debug.out("Failed to instantiate unchoker factory '" + impl + "'", e);

            factory = new UnchokerFactory();
        }

        return (factory);
    }

    public Unchoker getUnchoker(boolean seeding) {
        if (seeding) {

            return (new SeedingUnchoker());

        } else {

            return (new DownloadingUnchoker());
        }
    }
}
